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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/90234] 503.bwaves_r is 6% slower on Zen1/Zen2 CPUs at
 -Ofast with native march/mtune than with generic ones
Date: Thu, 30 Jul 2020 20:16:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90234

Martin Jambor <jamborm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|503.bwaves_r is 6% slower   |503.bwaves_r is 6% slower
                   |on Zen1 CPUs at -Ofast with |on Zen1/Zen2 CPUs at -Ofast
                   |native march/mtune than     |with native march/mtune
                   |with generic ones           |than with generic ones

--- Comment #2 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I spoke too soon, I can see this in May gcc 10.1 data on zen1 machine and a=
lso
in current master (6e1e0decc9e) on a zen-2 machine, still about 6% in both
cases.

(Gcc9 does not have this problem on zen2 but does on zen1 so it looks a bit
fragile).=